Book-sewing machine.



F. KUGLER.

BOOK SEWING MACHINE.

APPLICATION FILED MAY 6, 1912,

1,088,348. Patented Feb. 24, 19m

FRIEDRICH KUGLER, OF FRAUENFELD, SJVITZERLANID.

BOOK-SEWING MACHINE.

nesasae.

Specification of Letters Patent.

Patented Feb. 2 1-, 1914.

Application filed May 6, 1912. Serial No. 695,530.

To all whom it may concern:

Be it known that I, Fninnnion: KUGLER, a subject of the Emperor of Germany, residing at Frauenfeld, Switzerland, have invented new and useful Improvements in Book-Sewing Machines; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to letters or figures of reference marked thereon, which form a part of this specification.

My invention relates to book sewing machines and the object of my invention is to provide an improved mechanism for impelling the hook needles of such machines.

The hook needles as is well known are in their topmost and their lowest position always to be turned 180, for which purpose mostly a toothed rack and a toothed wheel are used. But the mechanisms of this type as hitherto constructed are very complicated. In one of these constructions both the toothed rack and the toothed wheel are moved in the direction. of the needle and with the needle. This construction possesses the drawback that by the great weights of the parts to be moved the speed of the machine could not be as great as desired. In a second construction the toothed rack is not moved to and fro but the toothed wheel is connected to the needle spindle by means of a pin engaging a groove of the spindle and each needle spindle is provided with a universal joint for impelling the needles which are simultaneously to be rotated and displaced. By this construction the good working of the machine becomes easily disturbed by a play between the pin and the groove. It has further been proposed to arrange the needle spindles in. a slide, which is movably arranged in a longitudinal groove of a rail which in turn can be displaced in a vertical direction. But by this construction, the needles can only be turned when outside the books, viz., in their topmost position, so that the sewing is complicated and a great amount of thread has to be used. These drawbacks are avoided by the construction according to the present invention, in which the toothed rack is movable in a direction at right angles to the needle axis and the needle can be turned as well 1n its topmost as in its lowest position.

In the accompanying drawing Figure 1 is a side elevation of a construction according to my invention. Fig. 2 is a front elevation ofthe same.

The lateral walls a and Z) of the machine frame are secured to each other by means of a plate 0, which carries the guide (Z of the needle spindle e and arms 7 and f forming a guide for the toothed rack g. The up per part of the needle spindle is mounted to turn in two bearings provided on a how it. The toothed wheel 5 is secured to the spindle e. The how 7 is pivotally mounted on a cylindrical rod 76. The rod is mounted in bearings Z, m which are pivoted to levers 11,, 72 These levers are oscillated from the main shaft 0 which is rotated by any suitable means. The shaft 0 is provided with a cam disk 7) which acts on a roller 1* mounted at the lower end of a rod 8 which by its upper end is pivoted to thelever m The rod 8 is guided by a sleeve Q pivoted to the wall Z) of the machine frame. A second cam disk t acts on a pin a secured to a double armed lever a which is pivotally mounted on a projection of the wall Z). A link o pivotally connects the rod a to the toothed rack g. By this means the toothed rack is horizontally moved to and fro.

The machine operates as follows: By means of the cam disk 79 the needle spindle e is moved in the direction of the needle 6 whereby the toothed wheel 7' is moved across the toothed rack 5/ which is sumciently broad in order to mesh with the toothed wheel in every position of the latter. In the topmost and the lowest position of the needle the toothed rack g is moved to and fro by means of the cam disk 25 whereby the needle spindle e and the needle 6 are turned 180. In Fig. 2 the lowest position of the needle is shown in dotted lines.

I claim:

1. In a book sewing machine, a mechanism for impelling the hook needle which comprises, a toothed rack movable in a direction at right angles only to the needle axis, means for reciprocating said rack, a needle spindle carrying at its lower end the needle, a toothed wheel secured to the needle spindle, the toothed rack being sufficiently broad to mesh with the toothed wheel in every position of the latter and means for moving the needle spindle to and fro in its longitudinal direction.

2. In a book sewing machine, a mechanism for impelling the hook needle which comprises, an inclined toothed rack movable in a direction at right angles only to the needle axis, a cam disk, a lever oscillated by the cam disk, a link connecting the lever to said rack, an inclined needle spindle, a toothed wheel secured to the needle spindle, the toothed rack being sufficiently broad to mesh with the toothed wheel in every position of the latter, and means for moving the needle spindle to and fro in its longitudinal direction.

3. In a book sewing machine, a mechanism for impelling the hook needle which comprises an inclined toothed rack movable in a direction at right angles only to the needle axis, a driving shaft, a cam disk carried thereby, a lever oscillated by the cam disk, a link connecting the lever and rack, parallel levers pivoted on the machine frame, a rod connecting the levers, an actuating rod connected to one of said levers, a cam n the driving shaft for reciprocating said ctuating rod, a bow mounted on the con ecting rod, an inclined needle spindle jourm led in the bow, and a toothed wheel secured to the spindle between the arms of the bow and meshing with the toothed rack, said rack being sufiiciently broad to mesh with the toothed wheel in every posit-ion of the latter.

In testimony that I claim the foregoing as my invention I have signed my name in presence of two subscribing witnesses.

FRIEDRICH KUGLER. Witnesses:

CARL GUBLER, ERNST FISCHER.

Copies of this patent may be I obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. G. 

